The products obtained on heating ${\mathrm{LiNO}}_3$ will be

The reaction is $4{\mathrm{LiNO}}_3\to 2{\mathrm{Li}}_2\mathrm{O}+4{\mathrm{NO}}_2+{\mathrm{O}}_2$ 

Other alkali metal nitrates behave differently from lithium nitrate. Metal oxide, ${\mathrm{NO}}_2$, and ${\mathrm{O}}_2$ are produced during the thermal breakdown of lithium nitrate. In contrast, heating other alkali metal nitrate results in metal nitrite and oxygen.